Joint structure of wooden boards and wooden fixtures using said joint structure

Abstract

To provide a joining structure of a woody plate material in which the woody plate materials are easily and firmly jointed together, and a wooden furniture using the joining structure.SOLUTION: In a joining structure of a woody plate material 1, edge faces 11A, 11B of facing woody plate materials 1A, 1B are jointed together, and inclined surfaces 14A, 14B are formed at the edge faces 11A, 11B, and a rod-like member 20 is buried in intermediate parts of the inclined surfaces 14A, 14B in a facing direction Ds of the woody plate materials 1A, 1B.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joint structure for wooden boards and a wooden fixture using the joint structure. [Background technology]

[0002] There are various types of joining structures for joining wooden boards together at their end faces. When joining wooden boards together, it is sometimes required to increase the joining strength. For example, Patent Document 1 discloses a joint structure for wooden flooring materials, which is formed by joining one wooden flooring material with a protrusion formed on its end surface to another wooden flooring material with a groove formed on its end surface, in which the depth of the groove is made larger than the protrusion dimension, and a notched groove extending along the groove is formed in the bottom surface of the other wooden flooring material below the groove, and in the jointed state, a gap is formed between the upper end face above the protrusion of one wooden flooring material and the upper end face above the groove of the other wooden flooring material, and the lower end face below the protrusion of one wooden flooring material is butted against the lower end face below the groove of the other wooden flooring material. In the configuration disclosed in Patent Document 1, the joint surfaces of the wooden flooring material must be processed into a complex shape with protrusions and grooves, and forming the joint surfaces is not easy.

[0003] Furthermore, Patent Document 2 discloses a finger joint for structural vertical joints of wood in which the finger joint portion is configured in a scarf shape. Patent Document 3 discloses a configuration in which two plates, each having a number of parallel grooves formed on its scarf surface, are overlapped with an adhesive so that the scarf surfaces of both plates interlock, and a pair of pressure members are used to apply hot or cold pressure to the overlapped scarf surfaces from the front and back of the plates, thereby hardening the adhesive and joining the plates. In the configurations disclosed in Patent Documents 2 and 3, a so-called finger joint is used, and in this case too, the shape of the joining surface is complex, and it is not easy to form the joining surface. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-109734 [Patent Document 2] Publication No. 61-175406 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-31396 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem that the present invention aims to solve is to provide a joining structure for wooden boards that can easily and firmly join wooden boards together, and wooden fixtures that use said joining structure. [Means for solving the problem]

[0006] The inventors have come up with the present invention by focusing on the fact that, as a joining structure for wooden boards, by providing inclined surfaces (tapered portions) or stepped portions on the end faces of opposing wooden boards, inserting rod-shaped steel material in a direction that intersects with both inclined surfaces or stepped portions, and bonding the inclined surfaces or stepped portions together with an adhesive, even if the adhesive surfaces peel off, the rod-shaped members will provide tensile resistance and brittle fracture can be suppressed. In order to solve the above problems, the present invention employs the following means. In other words, the joining structure for wooden boards of the present invention is a joining structure for wooden boards that joins the end faces of opposing wooden boards, characterized in that an inclined surface or a step portion is formed on the end faces, and a rod-shaped member is embedded in the middle part of the inclined surface or step portion in the opposing direction of the wooden boards. With this configuration, rod-shaped members are embedded in the middle of the inclined surfaces or steps formed on the end faces of the wooden boards where they are joined, in opposing directions of the wooden boards, so that when a bending moment acts in the out-of-plane direction, the rod-shaped members resist it. Furthermore, the simple structure of forming an inclined surface or a step on the end surface and connecting it with a rod-shaped member allows the end surface of the wooden board to have a simple shape, making it easy to process and join the wooden boards. In this way, wooden boards can be easily and firmly joined together.

[0007] The joining structure for wood boards of the present invention is a joining structure for wood boards for joining the end faces of wood boards, and comprises: a first wood board having, on its end face, either an inclined surface that is inclined diagonally relative to the surface, or a step portion including an inner surface formed inward from the surface and facing the same direction as the surface, and an intersecting surface formed so as to intersect with the inner surface and extend inward in the thickness direction; a second wood board having, on its end face to be joined to the first wood board, the inclined surface or the step portion formed in a shape corresponding to the end face of the first wood board; and a rod-shaped member; wherein each of the first wood board and the second wood board has holes formed at corresponding positions on the inclined surface or the intersecting surface, and the corresponding inclined surfaces or step portions abut against each other and are bonded with an adhesive, and the rod-shaped member is inserted into each of the holes to be joined. With this configuration, the first and second wooden boards are joined together with adhesive at their corresponding inclined or stepped portions, increasing the area where the end faces of the first and second wooden boards abut, ensuring the strength of the joint structure between the wooden boards with the adhesive, and firmly joining the wooden boards together. Furthermore, since the first and second wooden boards are joined by rod-shaped members, even if a shift occurs between the first and second wooden boards, the rod-shaped members inserted into the first and second wooden boards act as tensile resistance members, making it possible to maintain the joined state of the first and second wooden boards. Furthermore, in a structure where the end faces are simply joined with adhesive, such as a typical scarf joint, if a bending moment acts in the out-of-plane direction and the adhesive peels off, the load that can be supported drops suddenly and the joint will fail brittle. However, in the configuration described above, the first and second wood boards are joined by rod-shaped members in addition to adhesive, so even if the adhesive surface peels off, the rod-shaped members ensure deformation performance after reaching strength, allowing them to resist the bending moment and preventing brittle failure. As described above, the adhesive ensures the strength of the joined structure of the wooden boards, while the rod-shaped members ensure deformation performance after the strength is reached, so that the wooden boards are firmly joined together. Furthermore, because the end faces are simply formed with inclined surfaces or steps and connected with rod-shaped members, the end faces of the first and second wooden boards can be made into simple shapes, making it easy to process and join the wooden boards. In this way, wooden boards can be easily and firmly joined together.

[0008] In one aspect of the present invention, the end faces of the first wood board and the second wood board have edge surfaces formed at different positions when viewed in a plane, which intersect with each of the surfaces on both sides and extend inward in the thickness direction, and the inclined surface and the step portion are formed between the inner ends of the edge surfaces in the thickness direction. According to this configuration, the above-described joining structure can be more appropriately realized.

[0009] In one aspect of the present invention, the wooden fixture having the wooden board joint structure of the present invention is a wooden fixture formed by the wooden board joint structure as described above, characterized in that the surface of at least one of the first wooden board and the second wooden board is formed to be bent or curved, and is a chair, table, or partition wall. According to this configuration, by using the above-described wooden board joining structure, it is possible to easily and firmly join the first and second wooden boards that make up the wooden fixture together at the joint between them. Also, by forming the surface of at least one of the first and second wooden boards to be bent or curved, it is possible to form a curved chair or table, or a wooden fixture that forms a partition wall. [Effects of the Invention]

[0010] According to the present invention, it is possible to easily and firmly join wooden boards together. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view showing the configuration of a joining structure for wooden boards according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of FIG. [Figure 3] 1 is a cross-sectional view showing the configuration of an end face of one of the wooden boards joined in the joining structure of the wooden boards. FIG. [Figure 4] 10 is a cross-sectional view showing the configuration of the end face of the other wooden board to be joined in the joining structure of the wooden boards. FIG. [Figure 5] FIG. 3 is a cross-sectional view showing the configuration of a modified example of the joining structure for wooden boards according to the first embodiment of the present invention. [Figure 6] FIG. 5 is a cross-sectional view showing the configuration of a joining structure for wooden boards according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a perspective view showing a joint structure for wooden boards according to a third embodiment of the present invention, and the configuration of a wooden fixture using the joint structure. [Figure 8] FIG. 8 is a perspective view showing an example of a wooden board that constitutes the wooden fixture shown in FIG. 7. [Figure 9] 9 is a perspective view showing an example of a pseudo-curved portion formed by combining and joining the wooden boards shown in FIG. 8. FIG. [Figure 10] FIG. 2 is a plan view of a test specimen used in the examples. [Figure 11]FIG. 1 is a diagram showing a test method for test specimens used in the examples. [Figure 12] 1 is a table showing the initial stiffness and maximum yield strength in Example and Comparative Examples 1 and 2. [Figure 13] 10 is a diagram showing the relationship between the bending moment at the center of the member and vertical displacement in Comparative Example 1. FIG. [Figure 14] 10 is a diagram showing the relationship between the bending moment at the center of the member and the vertical displacement in the example and the comparative example 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention provides a joining structure for wooden boards, which comprises a first wooden member and a second wooden member, each having an inclined surface (tapered portion) or a step portion formed on the end surface of the wooden board, and a rod-shaped steel material inserted in a direction intersecting both the inclined surfaces or step portions, and in which the inclined surfaces or step portions of the first wooden board and the second wooden board abut against each other and are bonded together with an adhesive. The first embodiment of the present invention is a joining structure for wooden boards in which sloped surfaces (tapered portions) are provided on the end faces of the wooden boards, steel rods are inserted in a direction intersecting the sloped surfaces, and the sloped surfaces of the opposing wooden boards are bonded together with an adhesive (Figs. 1 to 4). The second embodiment is a joining structure for wooden boards in which steps are provided on the end faces of the wooden boards, steel rods are inserted in a direction intersecting the sloped portions, and the stepped portions of the opposing wooden boards are bonded together with an adhesive (Fig. 6). Hereinafter, with reference to the accompanying drawings, a description will be given of an embodiment of a joint structure for wooden boards according to the present invention and a wooden fixture using the joint structure, based on the drawings. (First embodiment) A cross-sectional view showing the configuration of a joining structure for wooden boards according to a first embodiment of the present invention is shown in Fig. 1. Fig. 2 is a plan view of Fig. 1. As shown in Figures 1 and 2, the joining structure for wooden boards 1 in this embodiment involves joining two wooden boards 1 together by butting them together. Here, one of the wooden boards 1 to be joined is referred to as a first wooden board 1A, and the other wooden board 1 is referred to as a second wooden board 1B. The first wooden board 1A and the second wooden board 1B each have a plate shape. The first wooden board 1A and the second wooden board 1B are joined together with an end surface 11A of the first wooden board 1A and an end surface 11B of the second wooden board 1B butting against each other.

[0013] Fig. 3 is a cross-sectional view showing the configuration of an end face of one of the wooden boards joined in the wooden board joining structure. As shown in Fig. 3, the first wooden board 1A has a board-shaped portion 10A. The board-shaped portion 10A is made of a wooden material and has a predetermined thickness in the thickness direction Dt connecting one surface 12A and the other surface 13A. The first wooden board 1A may be, for example, a single board, a laminated lumber, a laminated veneer lumber (LVL), or the like. An end surface 11A of the first wooden board 1A that is joined to the second wooden board 1B has an inclined surface 14A and edge surfaces 15A and 16A. The inclined surface 14A is formed in the middle of the first wooden board 1A in the thickness direction Dt. The inclined surface 14A is inclined obliquely with respect to the surfaces 12A and 13A. Specifically, the inclined surface 14A is provided so that the surface on one side in the thickness direction Dt (the surface 12A side) approaches the other side (the surface 13A side) in the thickness direction Dt as it moves from the inside of the first wooden board 1A toward the outside, i.e., toward the second wooden board 1B, in the opposing direction Ds in which the first wooden board 1A and the second wooden board 1B face each other, and the cross-sectional area gradually decreases. In this way, the inclined surface 14A is provided at an angle so as to face one surface 12A side. The edge surfaces 15A, 16A are formed at different positions in the opposing direction Ds with respect to the surfaces 12A, 13A on both sides. When the first wood board 1A is viewed from above as shown in FIG. 2, the edge surfaces 15A, 16A are formed at different positions from each other. The edge surface 15A is formed so as to intersect with the surface 12A on one side in the thickness direction Dt, and in this embodiment in particular, to intersect perpendicularly with the surface 12A on one side in the thickness direction Dt and extend inward in the thickness direction Dt. The edge surface 16A is formed so as to intersect with the surface 13A on the other side in the thickness direction Dt and extend inward in the thickness direction Dt. The inclined surface 14A is formed between inner end portions 15s, 16s of the edge surfaces 15A, 16A in the thickness direction Dt.

[0014] Fig. 4 is a cross-sectional view showing the configuration of the end face of the other wooden board to be joined in the wooden board joining structure. As shown in Fig. 4, the second wooden board 1B has a plate-shaped portion 10B, similar to the first wooden board 1A. The plate-shaped portion 10B is a plate made of a wooden material and has a predetermined thickness in the thickness direction Dt connecting one surface 12B and the other surface 13B. The second wooden board 1B may be, for example, a single board, a laminated lumber, a laminated veneer lumber (LVL), or the like. The end surface 11B of the first wooden board 1B, which is joined to the first wooden board 1A, has a shape corresponding to the end surface 11A of the first wooden board 1A. The end surface 11B of the second wooden board 1B has a shape in which the surfaces 12B and 13B are inverted in the thickness direction Dt relative to the end surface 11A of the first wooden board 1A. The end surface 11B of the second wooden board 1B has an inclined surface 14B and edge surfaces 15B and 16B. The inclined surface 14B is formed in the middle of the second wooden board 1B in the thickness direction Dt. The inclined surface 14B is inclined obliquely with respect to the surfaces 12B and 13B. Specifically, the inclined surface 14B is provided so that the cross-sectional area gradually decreases from the surface located on one side in the thickness direction Dt (the surface 12B side) toward the other side (the surface 13B side) as it moves from the inside of the second wooden board 1B toward the outside, i.e., toward the first wooden board 1A, in the facing direction Ds. In this way, the inclined surface 14B is provided at an angle so as to face one surface 12B side. The edge surfaces 15B, 16B are formed at different positions in the opposing direction Ds with respect to the surfaces 12B, 13B on both sides. The edge surfaces 15B, 16B are formed at different positions when the second wood board 1B is viewed from above as shown in FIG. 2. The edge surface 15B is provided so as to extend inward in the thickness direction Dt, perpendicular to the surface 12B on one side in the thickness direction Dt. The edge surface 16B is provided so as to extend inward in the thickness direction Dt, perpendicular to the surface 13B on the other side in the thickness direction Dt. The inclined surface 14B is formed between inner end portions 15t, 16t of the edge surfaces 15B, 16B in the thickness direction Dt.

[0015] 1 to 4, holes 17A and 17B extending in the opposing direction Ds are formed at corresponding positions on the inclined surfaces 14A and 14B of the first and second wooden boards 1A and 1B. As shown in Fig. 2, a plurality of holes 17A and 17B are arranged side by side at intervals in the width direction of the first and second wooden boards 1A and 1B. As shown in FIG. 1, the first wooden board 1A and the second wooden board 1B are joined together with the inclined surfaces 14A and 14B, the edge surfaces 15A and 16B, and the edge surfaces 16A and 15B in contact with each other. The surface 12A of the first wooden board 1A and the surface 13B of the second wooden board 1B, and the surface 13A of the first wooden board 1A and the surface 12B of the second wooden board 1B, form the same plane. Both ends of a rod-shaped member 20 are inserted into the hole 17A in the first wooden board 1A and the hole 17B in the second wooden board 1B, respectively. In this way, the rod-shaped member 20 is embedded in the middle of the inclined surfaces 14A and 14B so as to extend in the opposing direction Ds of the wooden boards 1A and 1B. Furthermore, the end face 11A (inclined face 14A, edge faces 15A, 16A) of the first wooden board 1A and the end face 11B (inclined face 14B, edge faces 15B, 16B) of the second wooden board 1B are bonded to each other with adhesive 30. The adhesive 30 is also applied to the inside of the holes 17A, 17B, and the holes 17A, 17B and the rod-shaped members 20 are joined together with the adhesive 30. In this way, the first wooden board 1A, the second wooden board 1B, and the rod-shaped members 20 are each bonded to each other with adhesive. Here, the rod-shaped members 20 are formed from, for example, a metal material (steel rod) that has greater strength and rigidity than the wood-based material forming the first wooden board 1A and the second wooden board 1B. Fully threaded rods, round steel bars, deformed reinforcing bars, etc. can be used as the rod-shaped members 20. When fully threaded rods or deformed reinforcing bars with external thread grooves formed on the outer periphery are used as the rod-shaped members 20, the surface area is larger than that of round steel bars, increasing the contact area with the adhesive 30, and therefore the rod-shaped members 20 are more firmly bonded to the holes 17A and 17B. For example, polyurethane resin adhesives, epoxy resin adhesives, etc. can be used as the adhesive 30.

[0016] As shown in Figures 3 and 4, the first wooden board 1A and the second wooden board 1B as described above are formed by forming holes 17A and 17B in the raw material 10s of the plate-shaped portions 10A and 10B, and then cutting off the end 10b of the raw material 10s to match the shape of the end faces 11A and 11B. 1, to join the first wooden board 1A and the second wooden board 1B, adhesive 30 is applied to the end faces 11A, 11B of at least one of (preferably both of) the first wooden board 1A and the second wooden board 1B. Adhesive 30 is also applied to the insides of the holes 17A, 17B. A rod-shaped member 20 is inserted into one of the first wooden board 1A and the second wooden board 1B, for example, the hole 17A in the first wooden board 1A in this embodiment. Then, the rod-shaped member 20 is inserted into the other of the first and second wooden boards 1A and 1B (for example, the hole 17B in the second wooden board 1B in this embodiment), while the end face 11A of the first wooden board 1A and the end face 11B of the second wooden board 1B are brought close to each other and abutted. At this time, the edge faces 15A, 16A of the first wooden board 1A abut against the edge faces 16B, 15B of the second wooden board 1B, which facilitates positioning of the first wooden board 1A and the second wooden board 1B in the facing direction Ds. As the adhesive 30 hardens, the first wooden board 1A, the second wooden board 1B, and the rod-shaped member 20 are firmly joined together.

[0017] The joining structure of the wooden board 1 as described above is a joining structure of the wooden boards 1A and 1B that joins the end faces 11A and 11B of the opposing wooden boards 1A and 1B, in which inclined surfaces 14A and 14B are formed on the end faces 11A and 11B, and a rod-shaped member 20 is embedded in the middle part of the inclined surfaces 14A and 14B in the opposing direction Ds of the wooden boards 1A and 1B. According to this configuration, the rod-shaped member 20 is embedded in the middle of the inclined surfaces 14A, 14B formed on the end faces 11A, 11B of the wooden boards 1A, 1B that are joined together, in the opposing direction Ds of the wooden boards 1A, 1B, so that when a bending moment acts in the out-of-plane direction, the rod-shaped member 20 resists it. Furthermore, the simple configuration of forming inclined surfaces 14A, 14B on end surfaces 11A, 11B and connecting them with rod-shaped members 20 allows end surfaces 11A, 11B of wooden boards 1A, 1B to have a simple shape, which makes it easy to process and join wooden boards 1A, 1B. In this way, the wooden boards 1A and 1B can be easily and firmly joined together.

[0018] The joining structure of the wooden board 1 joins the end faces 11A, 11B of the wooden board 1, and comprises a first wooden board 1A having an inclined surface 14A formed on the end face 11A that is obliquely inclined relative to the surfaces 12A, 13A, a second wooden board 1B having an inclined surface 14B formed on the end face 11B that is joined to the first wooden board 1A and has a shape corresponding to the end face 11A of the first wooden board 1A, and a rod-shaped member 20, wherein holes 17A, 17B are formed in the inclined surfaces 14A, 14B of each of the first wooden board 1A and the second wooden board 1B at corresponding positions, and the corresponding inclined surfaces 14A, 14B are abutted against each other and bonded with adhesive 30, and the rod-shaped member 20 is inserted into each of the holes 17A, 17B to be joined. According to this configuration, the first wooden board 1A and the second wooden board 1B form a joining structure for joining the wooden boards 1 together, with the corresponding inclined surfaces 14A, 14B of the first wooden board 1A and the second wooden board 1B abutting against each other and bonded together with the adhesive 30. This increases the area where the end faces 11A, 11B of the first wooden board 1A and the second wooden board 1B abut against each other, and the adhesive 30 ensures the strength of the joining structure for the wooden boards 1A, 1B, thereby firmly joining the wooden boards 1A, 1B together. Furthermore, since the first wooden board 1A and the second wooden board 1B are joined by the rod-shaped member 20, even if a shift occurs between the first wooden board 1A and the second wooden board 1B, the rod-shaped member 20 inserted into the first wooden board 1A and the second wooden board 1B will resist, making it possible to maintain the joined state of the first wooden board 1A and the second wooden board 1B. Furthermore, in a structure where the end faces are simply joined with adhesive, such as a typical scarf joint, if a bending moment acts in the out-of-plane direction and the adhesive peels off, the load that can be supported drops suddenly and the structure will suffer brittle failure.However, in the configuration described above, the first wood board 1A and the second wood board 1B are joined by rod-shaped members 20 in addition to adhesive 30, so even if the adhesive surfaces peel off, the rod-shaped members 20 will resist the bending moment and brittle failure will be suppressed. As described above, the adhesive 30 ensures the strength of the joint structure of the wooden boards 1A, 1B, while the rod-shaped member 20 ensures deformation performance after the strength is reached, so that the wooden boards 1A, 1B are firmly joined together. Furthermore, the simple configuration of forming inclined surfaces 14A, 14B on end faces 11A, 11B and connecting them with rod-shaped members 20 allows end faces 11A, 11B of first wooden board 1A and second wooden board 1B to have simple shapes, making it easy to process and join wooden boards 1. In this way, the wooden boards 1 can be joined together easily and firmly.

[0019] In addition, on the end faces 11A, 11B of the first wooden board 1A and the second wooden board 1B, edge faces 15A, 16A, 15B, 16B are formed at different positions when viewed in a plane, relative to the surfaces 12A, 13A, 12B, 13B on both sides, so as to intersect with the surfaces 12A, 13A, 12B, 13B and extend inward in the thickness direction Dt, and the inclined faces 14A, 14B are formed between the inner end parts 15s, 15t, 16s, 16t in the thickness direction Dt of the edge faces 15A, 16A, 15B, 16B. According to this configuration, the above-described joining structure can be more appropriately realized.

[0020] Furthermore, the rod-shaped members 20 have higher rigidity than the first wooden board 1A and the second wooden board 1B. Specifically, the rod-shaped members 20 are made of a metal material. With this configuration, when a bending moment acts in the out-of-plane direction and the adhesive surface peels off, the rod-shaped member 20 resists the bending moment, and brittle fracture can be efficiently suppressed.

[0021] (Modification of the first embodiment) The joining structure of the wooden boards of the present invention and the wooden fixtures using said joining structure are not limited to the above-mentioned embodiment described with reference to the drawings, and various modifications are possible within the technical scope. For example, in the above embodiment, the first wooden board 1A and the second wooden board 1B have edge surfaces 15A, 16A, 15B, and 16B on both sides of the inclined surfaces 14A and 14B in the thickness direction Dt, but this is not limited to this. FIG. 5 is a cross-sectional view showing the configuration of a modified example of the joining structure for wooden boards according to the first embodiment of the present invention. For example, as shown in FIG. 5, the edge surfaces 15A, 16A, 15B, and 16B may not be provided, and the inclined surfaces 14C and 14D may be formed over the entire end surfaces 11A and 11B in the thickness direction Dt.

[0022] (Second embodiment) FIG. 6 is a cross-sectional view showing the configuration of a joint structure for wooden boards according to a second embodiment of the present invention. 6, the joining structure of the wooden boards 1 in this embodiment joins two wooden boards 1 together by butting them together. The first wooden board 1C and the second wooden board 1D are joined together with the end face 11C of the first wooden board 1C and the end face 11D of the second wooden board 1D butting against each other.

[0023] The first wooden board 1C has a plank-shaped portion 10C. The plank-shaped portion 10C is made of a wooden material and has a predetermined thickness in a thickness direction Dt connecting one surface 12C and the other surface 13C. The first wooden board 1C may be, for example, a single board, a laminated wood, a laminated veneer lumber (LVL), or the like. An end surface 11C of the first wooden board 1C that is joined to the second wooden board 1D has a step portion 20C and edge surfaces 15C and 16C. The step portion 20C is formed in the middle of the first wooden board 1C in the thickness direction Dt. The step portion 20C has inner surfaces 21C and 22C and an intersecting surface 23C. The inner surfaces 21C and 22C are formed inward in the thickness direction Dt from the surfaces 12C and 13C and parallel to the surfaces 12C and 13C. The inner surfaces 21C and 22C are formed at different positions in the thickness direction Dt. The inner surface 21C is formed closer to the surface 12C in the thickness direction Dt. The inner surface 22C is formed closer to the surface 13C in the thickness direction Dt. The inner surfaces 21C and 22C are formed at different positions in the opposing direction Ds in which the first wooden board 1C and the second wooden board 1D oppose each other. The inner surface 21C is formed inside the first wooden board 1C in the opposing direction Ds with respect to the intersecting surface 23C, which will be described later. The inner surface 22C is formed on the outer side of the first wooden board 1C (the second wooden board 1D side) in the facing direction Ds with respect to the intersecting surface 23C. Both the inner surfaces 21C and 22C are formed to face the same direction as the front surface 12C in the thickness direction Dt. The intersecting surface 23C is formed between the inner side surface 21C and the inner side surface 22C. The intersecting surface 23C is formed to intersect the inner side surfaces 21C and 22C and extend inward in the thickness direction Dt. In particular, in this embodiment, the intersecting surface 23C is formed to be perpendicular to the inner side surfaces 21C and 22C. The edge surfaces 15C, 16C are formed at different positions in the opposing direction Ds relative to the surfaces 12C, 13C on both sides. The edge surfaces 15C, 16C are formed at different positions when the first wood board 1C is viewed from above. The edge surface 15C is formed so as to intersect with the surface 12C on one side in the thickness direction Dt, and in this embodiment in particular, to intersect perpendicularly with the surface 12C on one side in the thickness direction Dt and extend inward in the thickness direction Dt. The edge surface 16C is formed so as to intersect with the surface 13C on the other side in the thickness direction Dt and extend inward in the thickness direction Dt. The step portion 20C is formed between inner end portions 15s, 16s of the edge surfaces 15C, 16C in the thickness direction Dt. That is, an inner surface 21C is provided at the inner end portion 15s of the edge surface 15C in the thickness direction Dt so as to be perpendicular to the edge surface 15C, an inner surface 22C is provided at the inner end portion 16s of the edge surface 16C in the thickness direction Dt so as to be perpendicular to the edge surface 16C, and an intersection surface 23C is provided between the inner surface 21C and the inner surface 22C so as to be perpendicular to the inner surface 21C and the inner surface 22C.

[0024] The second wood board 1D has a plank-shaped portion 10D, similar to the first wood board 1C. The plank-shaped portion 10D is made of a wooden material and has a predetermined thickness in the thickness direction Dt connecting one surface 12D and the other surface 13D. The second wood board 1D may be, for example, a single board, a laminated wood, a laminated veneer lumber (LVL), or the like. The end surface 11D of the second wooden board 1D, which is joined to the first wooden board 1C, has a shape corresponding to the end surface 11C of the first wooden board 1C. The end surface 11D of the second wooden board 1D has a shape obtained by inverting the surfaces 12D and 13D in the thickness direction Dt relative to the end surface 11C of the first wooden board 1C. The end surface 11D of the second wooden board 1D, which is joined to the first wooden board 1C, has a step portion 20D and edge surfaces 15D and 16D. The step portion 20D is formed in the middle of the second wood board 1D in the thickness direction Dt. The step portion 20D has inner surfaces 21D and 22D and an intersecting surface 23D. The inner surfaces 21D and 22D are formed inward in the thickness direction Dt from the surfaces 12D and 13D and parallel to the surfaces 12D and 13D. The inner surfaces 21D and 22D are formed at different positions in the thickness direction Dt. The inner surface 21D is formed closer to the surface 12D in the thickness direction Dt. The inner surface 22D is formed closer to the surface 13D in the thickness direction Dt. The inner surfaces 21D and 22D are formed at different positions in the opposing direction Ds. The inner surface 21D is formed inside the second wood board 1D in the opposing direction Ds with respect to an intersecting surface 23D, which will be described later. The inner surface 22D is formed on the outer side of the second wooden board 1D (the first wooden board 1C side) in the facing direction Ds with respect to the intersecting surface 23D. Both the inner surfaces 21D and 22D are formed to face the same direction as the front surface 12D in the thickness direction Dt. The intersecting surface 23D is formed between the inner side surface 21D and the inner side surface 22D. The intersecting surface 23D is formed so as to intersect the inner side surfaces 21D and 22D and extend inward in the thickness direction Dt. In particular, in this embodiment, the intersecting surface 23D is formed so as to be perpendicular to the inner side surfaces 21D and 22D. The edge surfaces 15D, 16D are formed at different positions in the opposing direction Ds with respect to the surfaces 12D, 13D on both sides. The edge surfaces 15D, 16D are formed at different positions when the second wood board 1D is viewed from above. The edge surface 15D is formed so as to intersect with the surface 12D on one side in the thickness direction Dt, and in particular in this embodiment, to extend inward in the thickness direction Dt, perpendicular to the surface 12D on one side in the thickness direction Dt. The edge surface 16D is formed so as to extend inward in the thickness direction Dt, perpendicular to the surface 13D on the other side in the thickness direction Dt. Step portion 20D is formed between inner end portions 15t, 16t of edge surfaces 15D, 16D in the thickness direction Dt. That is, an inner side surface 21D is provided at inner end portion 15t of edge surface 15D in the thickness direction Dt so as to be perpendicular to edge surface 15D, an inner side surface 22D is provided at inner end portion 16t of edge surface 16D in the thickness direction Dt so as to be perpendicular to edge surface 16D, and an intersection surface 23D is provided between inner side surface 21D and inner side surface 22D so as to be perpendicular to these inner side surfaces 21D and inner side surface 22D.

[0025] Holes 17C, 17D extending in the opposing direction Ds are formed at corresponding positions on the intersecting surfaces 23C, 23D of the step portions 20C, 20D of the first wooden board 1C and the second wooden board 1D. The holes 17C, 17D are arranged side by side at intervals in the width direction of the first wooden board 1C and the second wooden board 1D when viewed from the thickness direction Dt. The first wooden board 1C and the second wooden board 1D are joined together with step portions 20C and 20D, i.e., inner surfaces 21C and 22D, inner surfaces 22C and 21D, intersecting surfaces 23C and 23D, edge surfaces 15C and 16D, and edge surfaces 16C and 15D, in contact with each other. Surface 12C of the first wooden board 1C and surface 13D of the second wooden board 1D, and surface 13C of the first wooden board 1C and surface 12D of the second wooden board 1D, form the same plane. Both ends of a rod-shaped member 20 are inserted into holes 17C in the first wooden board 1C and 17D in the second wooden board 1D, respectively. In this way, the rod-shaped member 20 is embedded in the intermediate portion of the step portions 20C, 20D so as to extend in the direction Ds in which the wooden boards 1C, 1D face each other. Furthermore, an end face 11C (step portion 20C, edge surfaces 15C, 16C) of the first wooden board 1C and an end face 11D (step portion 20D, edge surfaces 15D, 16D) of the second wooden board 1D are bonded to each other with adhesive 30. Adhesive 30 is also applied to the insides of holes 17C, 17D, and holes 17C, 17D and rod-shaped members 20 are joined together with adhesive 30. In this way, the first wooden board 1C, second wooden board 1D, and rod-shaped members 20 are each bonded to each other with adhesive. Here, the rod-shaped members 20 are formed from, for example, a metal material (steel rod) that has greater strength and rigidity than the wood-based material forming the first wooden board 1C and the second wooden board 1D. Fully threaded rods, round steel bars, deformed reinforcing bars, etc. can be used as the rod-shaped members 20. When fully threaded rods or deformed reinforcing bars with external thread grooves formed on the outer periphery are used as the rod-shaped members 20, the surface area is larger than that of round steel bars, increasing the contact area with the adhesive 30, and therefore the rod-shaped members 20 are more firmly joined to the holes 17C and 17D. For example, polyurethane resin adhesive, epoxy resin adhesive, etc. can be used as the adhesive 30.

[0026] The joining structure of the wooden board 1 as described above is a joining structure of the wooden boards 1C, 1D that joins the end faces 11C, 11D of the opposing wooden boards 1C, 1D, in which step portions 20C, 20D are formed on the end faces 11C, 11D, and a rod-shaped member 20 is embedded in the middle part of the step portions 20C, 20D in the opposing direction Ds of the wooden boards 1C, 1D. According to this configuration, the rod-shaped member 20 is embedded in the middle of the step portions 20C, 20D formed on the end faces 11C, 11D of the wooden boards 1C, 1D that are joined to each other, in the opposing direction Ds of the wooden boards 1C, 1D, so that when a bending moment acts in the out-of-plane direction, the rod-shaped member 20 resists it. Furthermore, the simple configuration of forming step portions 20C, 20D on end faces 11C, 11D and connecting them with rod-shaped members 20 allows end faces 11C, 11D of wooden boards 1C, 1D to have a simple shape, making it easy to process and join wooden boards 1C, 1D. In this way, the wooden boards 1C and 1D can be easily and firmly joined together.

[0027] The joining structure of the wooden board 1 for joining the end faces 11C, 11D of the wooden board 1 includes a first wooden board 1C having a step portion 20C formed on the end face 11C, the step portion 20C including inner surfaces 21C, 22C formed inward from the surfaces 12C, 13C and facing the same direction as the surfaces 12C, 13C, and an intersecting surface 23C formed so as to intersect the inner surfaces 21C, 22C and extend inward in the thickness direction Dt; The first wooden board 1C and the second wooden board 1D are provided with a second wooden board 1D having a step portion 20D formed in a shape corresponding to the end face 11C of the first wooden board 1C, and a rod-shaped member 20. Each of the first wooden board 1C and the second wooden board 1D has holes 17C, 17D formed at corresponding positions on the intersecting surfaces 23C, 23D, and the corresponding step portions 20C, 20D abut against each other and are bonded with adhesive 30, and the rod-shaped member 20 is inserted into each of the holes 17C, 17D and joined. According to this configuration, the first wooden board 1C and the second wooden board 1D form a joining structure for joining the wooden boards 1 together, with the corresponding step portions 20C, 20D of the first wooden board 1C and the second wooden board 1D abutting against each other and bonded together with the adhesive 30. This increases the area where the end faces 11C, 11D of the first wooden board 1C and the second wooden board 1D abut against each other, and the adhesive 30 ensures the strength of the joining structure of the wooden boards 1, firmly joining the wooden boards 1C, 1D to each other. Furthermore, since the first wooden board 1C and the second wooden board 1D are joined by the rod-shaped member 20, even if a shift occurs between the first wooden board 1C and the second wooden board 1D, the rod-shaped member 20 inserted into the first wooden board 1C and the second wooden board 1D will resist, making it possible to maintain the joined state of the first wooden board 1C and the second wooden board 1D. Furthermore, in a structure where the end faces are simply joined with adhesive, such as a typical scarf joint, if a bending moment acts in the out-of-plane direction and the adhesive peels off, the load that can be supported drops suddenly and the structure will suffer brittle failure.However, in the configuration described above, the first wood board 1C and the second wood board 1D are joined by rod-shaped members 20 in addition to adhesive 30, so even if the adhesive surfaces peel off, the rod-shaped members 20 will resist the bending moment and brittle failure will be suppressed. As described above, the adhesive 30 ensures the strength of the joined structure of the wooden boards 1C and 1D, while the rod-shaped member 20 ensures deformation performance after the strength is reached, thereby firmly joining the wooden boards 1C and 1D together. Furthermore, the simple configuration of forming steps 20C, 20D on end faces 11C, 11D and connecting them with rod-shaped members 20 allows end faces 11C, 11D of first wooden board 1C and second wooden board 1D to have simple shapes, making it easy to process and join wooden boards 1. In this way, the wooden boards 1 can be joined together easily and firmly.

[0028] In addition, on the end faces 11C, 11D of the first wooden board 1C and the second wooden board 1D, edge faces 15C, 16C, 15D, 16D are formed at different positions when viewed in a plane, relative to the surfaces 12C, 13C, 12D, 13D on both sides, and are formed so as to intersect with the surfaces 12C, 13C, 12D, 13D and extend inward in the thickness direction Dt, and step portions 20C, 20D are formed between the inner ends 15s, 15t, 16s, 16t in the thickness direction Dt of the edge faces 15C, 16C, 15D, 16D. According to this configuration, the above-described joining structure can be more appropriately realized.

[0029] Furthermore, the rod-shaped member 20 has higher rigidity than the first wooden board 1C and the second wooden board 1D. Specifically, the rod-shaped member 20 is made of a metal material. With this configuration, when a bending moment acts in the out-of-plane direction and the adhesive surface peels off, the rod-shaped member 20 resists the bending moment, and brittle fracture can be efficiently suppressed.

[0030] (Third embodiment) Fig. 7 is a perspective view showing a joining structure for wooden boards according to a third embodiment of the present invention and the configuration of a wooden fixture using said joining structure. Fig. 8 is a perspective view showing an example of wooden boards that make up the wooden fixture shown in Fig. 7. Fig. 9 is a perspective view showing an example of a pseudo-curved portion formed by combining and joining the wooden boards shown in Fig. 8. As shown in Fig. 7, a wooden fixture 100 can be formed by sequentially joining multiple wooden boards 1 together using the joining structure for wooden boards 1 as shown in the first and second embodiments. The wooden fixture 100 is a combination of components used as, for example, a chair 101, a table 102, and a partition wall 103. The overall configuration and shape of the wooden fixture 100 shown in Fig. 7 is merely an example, and the wooden fixture 100 may function as only one of the chair 101, table 102, and partition wall 103, or may be a combination of two of the chair 101, table 102, and partition wall 103. The shape of the multiple wooden boards 1 that make up such wooden fixture 100 when viewed in plan is not limited to a rectangular shape, but may also be a trapezoid, a triangle, etc. By combining wooden boards 1 with such planar shapes and joining them using the joining structure of the wooden boards 1 as shown in the first and second embodiments, it is possible to form, for example, portions 111, 112, etc. that curve and extend in the width direction when viewed in plan. Furthermore, by placing multiple wooden boards 1 upright on the floor and joining them using the joining structure of the wooden boards 1 as shown in the first and second embodiments, wall-like portions 121, 122, etc. can be formed. Here, as shown in Fig. 8, at least one of the first wooden board 1A and the second wooden board 1B (in the example of Fig. 8, the second wooden board 1B) may have a bent or curved surface 12W, 13W. By joining such a first wooden board 1A and a second wooden board 1B together, a pseudo-curved portion 115 that is curved in the thickness direction can be formed, as shown in Figs. 7 and 9. This allows the construction of a chair 101, a table 102, or a partition wall 103 with a curved surface formed by the pseudo-curved portion 115.

[0031] The wooden fixture 100 of this modified example is a wooden fixture 100 having the joining structure of the wooden boards 1 as described above, in which at least one surface 12W, 13W of the first wooden board 1A and the second wooden board 1B is formed to be bent or curved, and is a chair 101, a table 102, or a partition wall 103. According to this configuration, by forming the wooden fixture 100 using the joining structure of the wooden boards 1 as described above, it becomes possible to easily and firmly join the wooden boards 1 together at the joints between the first wooden boards 1A and the second wooden boards 1B that make up the wooden fixture 100. Furthermore, by forming the surfaces 12W, 13W of at least one of the first wooden board 1A and the second wooden board 1B to be bent or curved, it becomes possible to form the wooden fixture 100 that constitutes the curved chair 101, table 102, or partition wall 103.

[0032] (Modification of the third embodiment) In the above embodiment, the configuration shown in the first embodiment was applied as the multiple wooden boards 1 that make up the wooden fixture 100, but this is not limited to this, and the first wooden board 1C and second wooden board 1D shown in the second embodiment may also be applied. In addition, the configurations given in the above embodiments can be selected or changed as appropriate without departing from the spirit of the present invention.

[0033] (Example of consideration) The joining structure of the wooden boards shown in the first embodiment and the joining structure of the wooden boards according to the conventional method were compared by bending tests, and the results are shown below. The test specimen was a flat plate made of beech wood, 35 mm thick, 200 mm wide, and 1100 mm long, with a joint at the center of the plate in the axial direction for a bending test. The joint conditions were varied as follows: Example: As shown in Figures 10 and 11, a configuration having inclined surfaces 14A and 14B as shown in the first embodiment was used, and a 98 mm long M8 fully threaded rod member 20 was arranged, and end faces 11A and 11B were bonded together with adhesive 30. Comparative Example 1: A flat plate without joints was used as a test specimen. Comparative Example 2: The end faces of two 600 mm long flat plates were scarf-jointed with an inclined surface for 100 m in the material axis direction, and the end faces were bonded together with an epoxy adhesive. The standard value for the material properties of beech wood is the bending modulus of elasticity of 16800N / mm 2 The allowable bending stress fb is 64.9N / mm 2 The short-term yield bending moment My is 2.65 kNm. In the bending test, a comparative verification was carried out on the bending stiffness and bending strength obtained from the relationship between the bending moment at the center of the member and the vertical displacement.

[0034] For each of the example and comparative examples 1 and 2, both ends of the test specimen were supported as shown in FIG. 11, and vertical forces were applied to two points at the center of the members. The results are shown below: Fig. 12 is a table showing the initial stiffness (bending stiffness) and maximum strength (bending strength) in Example and Comparative Examples 1 and 2. Fig. 13 is a diagram showing the relationship between the bending moment at the center of the member and vertical displacement in Comparative Example 1. As shown in Fig. 12 and Fig. 13, in Comparative Example 1, which did not have a joint, the bending rigidity was equivalent to the bending modulus, and the maximum strength was equal to or greater than the short-term yield bending moment. Figure 14 shows the relationship between the bending moment at the center of the member and vertical displacement in the example and comparative example 2. As shown in Figures 12 and 14, in comparative example 2, which used scarf joints and adhesive bonding, the adhesive surfaces peeled off and suffered brittle fracture at a bending moment of approximately 1 kNm. In the example, after the adhesive surface peeled off, the rod-shaped member resisted bending, preventing a sudden drop in load, and showing improved toughness. Eventually, the rod-shaped steel material came out and the load decreased. [Explanation of symbols]

[0035] 1 Wooden board material 20C, 20D step part 1A, 1C 1st wood board 21C, 21D, 22C, 22D Inside surface 1B, 1D Second wooden board 23C, 23D Intersection surface 11A~11D End face 30 Adhesive 12A~12D, 13A~13D, 12W, 13W Surface 100 Wooden fixtures 14A~14D Slope 101 Chair 15A~15D, 16A~16D Edge surface 102 Table 15s, 15t, 16s, 16t End 103 Partition wall 17A~17D Hole Ds Opposite direction (opposite direction) 20 Rod-shaped member Dt Thickness direction

Claims

1. A joining structure for joining end surfaces of opposing wooden boards, The end surface has an edge surface that intersects with the surface of the wood board and extends in the thickness direction, and an inclined surface or a step portion, a hole is formed in the inclined surface or the intermediate portion of the step portion in the direction of the wooden board facing each other, and a rod-shaped member is embedded in the hole; A joining structure for wooden boards, characterized in that the end faces of the wooden boards and the inner circumferential surface of the hole and the rod-shaped member are joined to each other with an adhesive.

2. A joining structure for joining end surfaces of wooden boards, On the end face, An edge surface that intersects the surface of the wood board and extends in the thickness direction; and An inclined surface that is inclined obliquely to the surface, or a first wood board having a step portion including an inner surface formed inward from the surface and facing in the same direction as the surface, and an intersecting surface formed to intersect the inner surface and extend inward in the thickness direction; A second wood board having an end surface to be joined to the first wood board, the end surface and the inclined surface or the step portion formed in a shape corresponding to the end surface of the first wood board; a rod-shaped member having higher rigidity than the first wooden board and the second wooden board; Equipped with A joining structure for wooden boards, characterized in that each of the first wooden board and the second wooden board has holes formed at corresponding positions on the inclined surfaces or the intersecting surfaces, and the corresponding inclined surfaces or step portions, and the inner surfaces of the holes and the rod-shaped members inserted into the holes are joined to each other with adhesive.

3. The inclined surface and the step portion are formed between inner ends of the edge surface in the thickness direction, 3. The joining structure for wooden boards according to claim 2, wherein the rod-shaped members are embedded in the opposing wooden boards to a position outside the end faces of the wooden boards.

4. A wooden fixture having the wooden board joining structure according to claim 2 or 3, At least one surface of the first wood board and the second wood board is bent or curved, Wooden furniture that is a chair, table, or partition wall.

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